Bryan Alvarez mentioned on Friday’s Wrestling Observer Live that Konnan recently claimed on his podcast that Mysterio’s contract with Lucha Underground has expired. Konnan also hinted at the possibly that Rey could return to WWE for Sunday’s Royal Rumble event. Mysterio tweeted the following:

WWE Royal Rumble 2017 Rumors: -The Observer noted that both champions (WWE Championship and Universal Championship) might end up dropping the titles at Royal Rumble this Sunday.- According to Cagesideseats, Royal Rumble match winner can change anytime. The plan is there, all they have to decide is how to get there - According to Cagesideseats, Jerry Lawler and Dolph Ziggler at the Royal Rumble, possibly even during the actual match- Randy Orton is favourite to win WWE Royal Rumble 2017 match as per the latest betting odds- According to Cagesideseats,the entire NXT roster will be backstage, increasing the chances of the main roster debuts of Samoa Joe and Tyle Dillinger.- Seth Rollins and Triple H segment at the Royal Rumble?- Samoa Joe and several other superstars are also expected to make their main roster debut at Royal Rumble- There have been strong rumors of Kurt Angle and Kenny Omega entering Royal Rumble match- As reported by f4online.com, Rey Mysterio's contract with Lucha Underground is over and he is not resigning with the company. This hints one more possible surprise Royal Rumble return- Wrestling Observer Newsletter reported that the 2017 edition of the Royal Rumble has sold nearly 40,000 tickets for the Alamodome in San Antonio, Texas.- Ryan Satin of Pro Wrestling Sheet said on Lilian Garcia’s podcast Making Their Way To The Ring that there is a backstage push for Tye Dillinger to enter the Royal Rumble match as the 10th entrant.- Kenny Omega has said he will not be appearing at Royal Rumble

We now know that Big Cass and Rusev will be part of the Royal Rumble. Sami Zayn will also be a part of the Rumble match but at the expense of 'The Architect' Seth Rollins. Rollins looks like he won't be a part of the Rumble match after losing to Zayn, so will he be absent from the Royal Rumble card?

Thirty Superstars from Raw and SmackDown LIVE will fight for sports-entertainment immortality when the annual Royal Rumble Match takes over WWE Network on Sunday, Jan. 29. The winner of the massive melee, now in its 30th year, will go on to challenge for a World Championship in the main event of WrestleMania this April.

A tradition dating back to 1988, the Royal Rumble Match starts with two participants, and new Superstars entering the ring every 90 seconds. This continues until all 30 Superstars have entered the bout. Elimination occurs when a Superstar is thrown over the top rope and both of his feet hit the floor.

The last Superstar in the ring will be declared the victor.

The Deadman returns to reveal that he'll compete in the 2017 Royal Rumble Match.What other Superstars from Raw and SmackDown LIVE will join the fray and fight for the chance to headline The Grandest Stage of Them All? More important yet: Who will be the last man standing when the dust settles inside San Antonio’s historic Alamodome?

Find out when The Road to WrestleMania begins at WWE Royal Rumble 2017. The huge event takes place Sunday, Jan. 29, at 7 ET/4 PT, live on the award-winning WWE Network.